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D( x )
4*x-1 = 0
4*x-1 = 0
4*x-1 = 0
4*x-1 = 0 // + 1
4*x = 1 // : 4
x = 1/4
x in (-oo:1/4) U (1/4:+oo)
(12*x^2-(3*x)-10)/(4*x-1) = 0
(12*x^2-3*x-10)/(4*x-1) = 0
12*x^2-3*x-10 = 0
12*x^2-3*x-10 = 0
DELTA = (-3)^2-(-10*4*12)
DELTA = 489
DELTA > 0
x = (489^(1/2)+3)/(2*12) or x = (3-489^(1/2))/(2*12)
x = (489^(1/2)+3)/24 or x = (3-489^(1/2))/24
(x-((3-489^(1/2))/24))*(x-((489^(1/2)+3)/24)) = 0
((x-((3-489^(1/2))/24))*(x-((489^(1/2)+3)/24)))/(4*x-1) = 0
( x-((3-489^(1/2))/24) )
x-((3-489^(1/2))/24) = 0 // + (3-489^(1/2))/24
x = (3-489^(1/2))/24
( x-((489^(1/2)+3)/24) )
x-((489^(1/2)+3)/24) = 0 // + (489^(1/2)+3)/24
x = (489^(1/2)+3)/24
x in { (3-489^(1/2))/24, (489^(1/2)+3)/24 }
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